Want a dodgeball that changes color beneath your hand? Look no further than the Rhino® Skin Thermo Grip balls, which utilize a high-tech design to provide a long-lasting, no-sting product that's perfect for gym class, the playground and more. Kids love the bright colors! Mesh bag included. Heat-Activated Color Change. Diameter: 6.3"; Material(s): Foam; Color(s): Blue; Green; Orange; Red; Purple; Yellow; Quantity: 6/Set.